Safety device for machines



J. w. SCHADE SAFETY DEVICE FOR MACHINES Filed Dec. 28

Hwy

Patented Feb. 24, 1925.

or AKRON, omo,

JAMES w. SCHADE,

O'F NEW YORK,

TES

1,527,925 PATENT oFFicE.

lASSIGNOR T0 THE IB. F. GOODRIGH COMPANY, N. Y., A'CORPORATION OF NEW YORK.

SAFETY DEVICE FOR MACHINES.

Appiieatilon mea December 28, 1921.

To all whom it may concern:

Be it known'that I, JAMES citizen lof the United Akron, n

W. SoHADE, a

States, residing at the county ofSummit and State of Ohio, have invented a certain new and useful Safety Device for Machines, of which the following is a specification. This invention relates to safety devices for machines and is particularly applicable to beam presses of the type commonly used for die-stamping sheet `material such as sheet-metal, leather My object is to provide or rubberized fabric.

an improvedsafety device adapted to .insure thatthe op- ,.eratorwill not be injured by operating the machine while either .of his hands remains therein, and I attain this object by providing a latching mechanism requiring the use of both hands of the operator outside of the machine to release the actuatingmechanism.

Of the accompanying drawings, Fig. l is a front elevation of a beam press embodying a preferred form of my invention,

die therein.

work and a cutting with the Fig. 2 is a detached rear elevation, with parts bro-ken away, of a part Fig. 3 is a section on Referring to the drawings,

generally of my device.

line 3-3 of Fig. 2.

1 0 represents a beam press comprising an adjustable lower platen 11, a die block 11a thereon, adjusting screws 12,

-12 for raising and lowering said platen, a cross-beam or moving upper p vertically slidable bars through eccentric cams (not to said shaft just inside the laten 13 secured upon 14, 14, and a camshaft 15 for actuating said upper platen p shown) secured end standards 16, 16, said cams coacting withpitmans (not shown) hinged tov the lower ends f the bars 14, the construction and operation of such parts being well known in the art.

acutting die and 16b is the w-o vThe cam shaft 15 is cone clutch member 17 secure coacting with a belt pulley 18 clutch member,

constituting a 16a is rk in place.

proviled with a`v male d thereon. and

shiftable, constantly driven,

4 female conefo-r turning the camshaft 15 to operate the press at the will of the .op-

erator. 19. isv a shipper 2O on a bracket 212extending f lever fulcrumed at rom the frame of the press, for engaging and disengaging the clutch, said lever being actuated by a push rod- 22 hinged to its upper end and yconnected through 23, 23, pivoted on the frame o a pair of bell crank levers f the machine,

Serial No. 525,344.

and treadle rods 24, 24,` with -a treadle 25, the latter being secured at the rear of the machine to a rock-shaft 26 and connecteddrum by an arm 31 secured to the rock shaft 26. y

Upon-the frame of the press, a plate 32 is secured by means of screw bolts 33, 33, and slidably mounted in guide brackets 34, 34 on the rear face of this plate is a vertical bar 35 formed with latch-recesses 36, 36, said bar being connected with the treadle 25 by an adjustable link 37.

Pivoted on the rear face of the plate 32, at 38, 39 respectively., are two latch meinbers 40, 41v having the form of bell crank levers, their upwardly extending arms being provided respectively with latch-pawls 42, 43, adapted to enter the llatch recesses 36 under the action of tension springs 44, 45 connecting lthe horizontal arms of the respective bell crank levers with the plate 32.

Said arms are slotted respectively to1 receive vertically swinging pins 46, 47 extending through slots 48, 49 in the plate 32, from in-ountiiigs presently to be described, said pins beingadapted toswing the bell-crank 25 and consequent-J closing of the press.

front face of the plate 32 by screw bolts 50, 50, and extending forward through the frame of the press, are brackets, one of which is shown at 51, Fig. 3, formed with notches 52, 52 at their outer ends, to seat a pair of horizontal pipes 53, 54, and interfitting with plates 55, one of which is shown inl Fig. 3, through which plates the pipes extend, said plates 55 being drawn toward the brackets 51 by screw bolts 56, 56 Fig. 2) extending through the plate 32,

Secured to the to hold the pipes i'n the notches 52 of said brackets.

Extending through the pipes rotatably mounted in end caps 53, 54 and 57, 57 secured to said pipes are rocklshafts 59, 60,

53, 54 securely in position '61, 62 are held in releasing from which extend the"pins 46, 47 for turning the latch members 40, 41, said pins eX- tending through vertical slots (54, Fig. 3)

.in the pipes 53, 54 and through the"\slots 48, 49 in the plate 32, to the forked ends of\ said latch members.

For turnlng the rock-shaft 59, 60 I provide on each a plurality of short, spacedapart hand levers 61, 61, 6262, the intermediate ones of which extend through vertical slots 63, 64, in the pipes 53, 54.

In the operation of the press, one each of the two sets of hand levers 61, 62, are raised, turning both rock-shafts 59, 60, swinging the pins 47, 46 downward, and thereby turning the latch members 41, 40 on their pivots to release the vertical bar 35, which, through the link 37, normally prevents the depression of the treadle. The latter `is then depressed by the operators foot, releasing the brake-shoe 29 from the brake-drum 28, and, through the treadle rods 24,-bell-crank levers 23, push rod 22 and shipper lever 19 shifting the revolving belt pulley 18 into engagement with the coneclutch member 17 rotatingnthe cam-shaft l5 and-thereby actuating the press. As the platen 13 rises, the operator removes his foot from the treadle, which is then raised by the springs 27, applying the brake 28, 29, and raising the bar 35, which latter is again latched in its upper position by the latch members 40, 41, by reason ofthe springs 44, and the weight of the hand lerers`61, 62 turning said latch members and the rock-shafts 59, into latching position. I prefer to have the latch recesses 36 in the bar 35 of substantial length, as here shown, in order that suflicient time will be given for said parts to be returned to' latching position, thus assuring that the recesses will not be jumped by the pawls 42, 43, it being essential only that their up er ends in moving downward shall engage t e pawls and be stopped thereby before the clutch is thrown in, except when the hand levers position. To release the bar 35 and permit the press to be closed, both of the rock-shafts 59, 60 must be turned by hand, and the hand levers on the two are so positioned shafts, however, that as the operator changes his position along the front of the press, he always has a lever of each set within his reach.

The device is of simple construction and is\easily detachable. It may be modified without departing from the scope of my invention,` and I do not wholly limit my claims to the specific construction here shown.

I claim:

1. In apparatus of the combination of a power applying member, a pair of latch members adapted independently of each other to hold said power applying member out of operative position, rock shafts arranged lengthwise of one side -of the. apparatus and: adapted respectively to retract said latch members, and a plurality of hand-levers on each of said rock shafts, said hand levers being soy positioned that the operator, standing at different positions lengthwise of said rock shafts can reach a hand lever on each rock-shaft with his two hands at the same time, but cannot do so with one hand. v

2. In a safety device for a power-driven machine, a pair of substantially parallel rock shafts both adapted to be turned for the starting of the machine, spaced-apart handles projecting laterally from each of said rock-shafts," the handles on one shaft alternating with those on the other shaft to form successive pairs of handles longitudinally spaced apart, the sucthe character described,

and a plurality ofV cessive pairs of handles beinghclose enough together to be grasped at t e same time by the respective hands of an operator but not close enough to be so grasped by one hand.

3. In a safety device for a power-driven machine, the combination of power-starting means, and two series of spaced-apart contrl members disposed alongl one side of the machine, a member of each of said series being required to be at the same time engaged by the operator for actuating said power-starting means, and said members being sopositioned that the operator, at all stations along the series, can at the same timevengage a member of each series with his respective hands but cannot do so with that the operator is required to use both One-handhands to do this. It is thus assured that the press will not be closed with either of his hands between the platens. The several hand levers are so disposed along the rock In. Witness whereof I have 'hereunto set my hand this 23 day ofDecember, 1921.

- JAMES W. SCHADE. 

